CN1591233A - Apparatus for image forming - Google Patents

Apparatus for image forming Download PDF

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Publication number
CN1591233A
CN1591233A CNA2004100713096A CN200410071309A CN1591233A CN 1591233 A CN1591233 A CN 1591233A CN A2004100713096 A CNA2004100713096 A CN A2004100713096A CN 200410071309 A CN200410071309 A CN 200410071309A CN 1591233 A CN1591233 A CN 1591233A
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CN
China
Prior art keywords
mentioned
roller
speed
processing system
image processing
Prior art date
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Granted
Application number
CNA2004100713096A
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Chinese (zh)
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CN100489689C (en
Inventor
横山雅人
横川信人
安藤俊幸
小林和彦
筱原贤史
松田雄二
细川润
三浦洋平
高桥俊之
松田裕道
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Ricoh Co Ltd
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Ricoh Co Ltd
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Priority claimed from JP2003199451A external-priority patent/JP2005037620A/en
Priority claimed from JP2004136026A external-priority patent/JP4359533B2/en
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of CN1591233A publication Critical patent/CN1591233A/en
Application granted granted Critical
Publication of CN100489689C publication Critical patent/CN100489689C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1625—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer on a base other than paper
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0103—Plural electrographic recording members
    • G03G2215/0119—Linear arrangement adjacent plural transfer points
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0151—Apparatus for electrophotographic processes for producing multicoloured copies characterised by the technical problem
    • G03G2215/0158—Colour registration
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/16—Transferring device, details
    • G03G2215/1604—Main transfer electrode
    • G03G2215/1623—Transfer belt

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

An image forming apparatus including an image carrying member, a transfer member, support rollers, a detecting mechanism, and a controller. The image carrying member forms a toner image on its surface facing a surface of the transfer member, supported by the support rollers, which transfers the toner image to a recording medium. The detecting mechanism includes a detection roller, a roller shaft, a moving member, and a sensor, and detects a speed of the transfer member. The detection roller includes one support roller selected from the support rollers, and is provided with the roller shaft. The moving member is directly fixed to the roller shaft and rotates with the detection roller. The sensor detects a moving speed of the detection roller with the moving member. The controller controls a traveling speed of the transfer member to a target speed based on a detection result of the sensor.

Description

Image processing system
Technical field
The present invention relates to image processing system, be provided with a picture mounting body at least, form the toner picture on as the mounting body, obtain document image at this.
Background technology
Electronic copier for example, printer, facsimile recorder, or it is known for people to have the image processing system of the above-mentioned pattern that the compounding machine etc. of above-mentioned two kinds of functions constitutes at least.In recent years, wish the image processing system colorize, improve print speed, the requirement of equipment miniaturization grows to even greater heights, in order to satisfy these requirements, so-called " tandem moor " image processing system becomes main flow, in the tandem moor image processing system, picture mounting body and developing apparatus etc. constitute image-forming assembly, some image-forming assemblies are arranged in position with belting subtends such as moving belt or transfer belt, to in the short time, obtain coloured image as the transfer printing of the order of the toner picture on the mounting body on the recording medium or on the transfer belt.
For example, on some picture mounting bodies, form look different toner picture respectively, to transport by the transfer belt mounting on the recording medium of coming as superimposed transfer printing as each toner on the mounting body, this is called the image processing system of direct transfer printing mode, perhaps for example the spy opens clear 63-147177 (following brief note is " patent documentation 1 ") number communique (P2-3, Fig. 2), with each as the different toner of the look that forms on the mounting body as superimposed transfer printing on transfer belt, again the secondary colour on the transfer belt is adjusted as transfer printing on recording medium, this is called the image processing system of intermediate transfer mode, and above-mentioned image processing system is that people are known.
Transfer belt is erected on some backing rolls, and at least one roller constitutes driven roller in the backing roll, and driven roller drives transfer belt and moves.In the image processing system of this mode, some picture mounting bodies dispose side by side.
In this image processing system,, importantly, irregular from concentration not taking place as the toner picture of mounting body transfer printing on recording medium or transfer belt in order to improve the picture quality of final transfer printing on recording medium.So, with at least one roller in some backing rolls of above-mentioned transfer belt supporting usefulness as measuring roll, detected body is set, it turns round with this measuring roll, detect the angular velocity of this detected body by detection means, according to testing result, the controlling and driving motor, make transfer belt speed be called target velocity, this method had obtained employing in the past.By this structure, make transfer belt speed for certain, make and transport toner picture on the recording medium of coming by the transfer belt mounting that concentration does not take place is irregular, perhaps make irregular from concentration not taking place as the toner picture of mounting body transfer printing on transfer belt.
In image processing system in the past, as shown in Figure 1, measuring roll 10 is bearing on the roll shaft 42, roll shaft 42 is connected with bolster 61 by shaft coupling 60, will be fixed on this bolster 61 roll shaft 42 and the revolution of measuring roll 10 one as the detection dish 43 of detected body one example, the revolution of this roll shaft 42 is delivered to bolster 61 by shaft coupling 60, like this, make detection dish 43 turn round, by detect the angular velocity of above-mentioned detection dish 43 as the optical sensor 44 of detection means.According to testing result, the revolution of controlling and driving motor 13.
According to this configuration, roll shaft when relative supporting measuring roll, there is eccentric occasion in the bolster of fixing detected body, because of this off-centre is cause, along with revolution, velocity variations takes place in detected body periodically, this velocity variations composition is with other velocity variations compositions, obtained by the detection means detection, the controlling and driving motor is eliminated velocity variations.
But, the velocity variations of the eccentric caused detected body of the bolster of roll shaft does not take place because of the transfer belt velocity variations relatively, therefore, if controlling and driving motor, to eliminate the velocity variations of the eccentric caused detected body of bolster, can cause the transfer belt velocity variations on the contrary, like this, irregular from the toner picture meeting generation concentration that is transferred to as the mounting body on recording medium or the transfer belt.
Have again, thereby this tandem moor image processing system exists each color image not cause the problem that picture quality is low by correct superimposed generation color shift.For correct superimposed each color image, have several key elements, wherein importantly be with travelling speed to change.The inhibition zone velocity variations is to improve the key of look superimposed precision.
Tape speed changes various reasons, and for example, because the equipment miniaturization requirement, the size of each inter-module in image processing system becomes narrow, and like this, belting can be subjected to the influence of fixing device heat, and the speed of band changes.In order to address this is that, open in 2001-296755 (following brief note is " patent documentation 2 ") number communique for example spy, proposed in setting up the roller of band, to be provided with cooling heat pipe scheme, so that salband indirectly.But, cooling way is set will causes apparatus structure complicated, cause that cost rises.
In addition, the tape speed detection means is being set, in structure,, can not correctly controlling tape speed because of the thermal expansion of speed detection means itself from the signal stabilization tape speed of this speed detection means.
Summary of the invention
The present invention puts forward for solving the existing problem of above-mentioned prior art, the objective of the invention is to, and providing can the irregular image processing system of inhibition concentration.
Second purpose of the present invention is, effective inhibition zone velocity variations is provided, the image processing system of color shift does not take place.
To achieve these goals, the present invention proposes following scheme:
(1) a kind of image processing system is provided with:
At least one is as the mounting body, forms the toner picture at this on as the mounting body;
The ring-type transfer belt is erected on some backing rolls, is configured to and above-mentioned picture mounting body subtend;
CD-ROM drive motor, at least one backing roll constitutes driven roller among above-mentioned some backing rolls, and the above-mentioned driven roller revolution of above-mentioned drive motor is moved to drive above-mentioned transfer belt;
Detected body, at least one backing roll constitutes measuring roll among above-mentioned some backing rolls, and above-mentioned detected body turns round with above-mentioned measuring roll;
Pick-up unit detects the angular velocity of above-mentioned detected body;
Control device according to the testing result of above-mentioned detection device, is controlled above-mentioned CD-ROM drive motor, makes the speed of above-mentioned transfer belt become target velocity;
Be formed on above-mentioned as the toner on the mounting body as transfer printing in mounting in transporting on the above-mentioned transfer belt on the recording medium of coming, perhaps will be formed on toner on the above-mentioned picture mounting body as transfer printing on above-mentioned transfer belt, again with the toner on the transfer belt as transfer printing on recording medium, obtain document image;
Above-mentioned detected body directly is fixed on the roll shaft that is used to support above-mentioned measuring roll.
(2) in the image processing system of above-mentioned (1), make that the circumferential position of circumferential position and the least radius portion of the central axis of the relative above-mentioned roll shaft of above-mentioned detected body of maximum radius portion of central axis of the above-mentioned relatively roll shaft of above-mentioned measuring roll is roughly consistent, above-mentioned detected body is fixed on the above-mentioned roll shaft with this state.
(3) in the image processing system of above-mentioned (2), in the least radius standard laid down by the ministries or commissions of the Central Government of the central axis of the above-mentioned relatively roll shaft of above-mentioned detected body with mark.
(4) in the image processing system of above-mentioned (1), make that the circumferential position of circumferential position and the maximum radius portion of the central axis of the relative above-mentioned roll shaft of above-mentioned detected body of least radius portion of central axis of the above-mentioned relatively roll shaft of above-mentioned measuring roll is roughly consistent, above-mentioned detected body is fixed on the above-mentioned roll shaft with this state.
(5) in the image processing system of above-mentioned (4), in the maximum radius standard laid down by the ministries or commissions of the Central Government of the central axis of the above-mentioned relatively roll shaft of above-mentioned detected body with mark.
(6) a kind of image processing system is provided with:
At least one is as the mounting body, forms the toner picture at this on as the mounting body;
The band conveyer, mounting recording medium, be formed on toner on the picture mounting body as transfer printing on recording medium;
Fixing device carries out photographic fixing to the uncertain image of transfer printing on recording medium; It is characterized in that:
Be provided with speed detector, detect the speed of band conveyer,, carry out FEEDBACK CONTROL, make the speed of above-mentioned band conveyer become target velocity according to the detected value of above-mentioned speed detector;
Above-mentioned speed detector is configured in the place that the band temperature changes hardly.
(7) a kind of image processing system is provided with:
At least one is as the mounting body, forms the toner picture at this on as the mounting body;
Intermediate transfer belt, with above-mentioned be formed on toner picture on the picture mounting body by above-mentioned intermediate transfer belt transfer printing on recording medium;
Fixing device carries out photographic fixing to the uncertain image of transfer printing on recording medium; It is characterized in that:
Be provided with speed detector, detect the speed of above-mentioned intermediate transfer belt,, carry out FEEDBACK CONTROL, make the speed of above-mentioned intermediate transfer belt become target velocity according to the detected value of above-mentioned speed detector;
Above-mentioned speed detector is configured in the place that the band temperature changes hardly.
(8) a kind of image processing system is provided with:
Banded as the mounting body, this as the mounting body on order form electrostatic latent image;
Some developing apparatuss, be configured in above-mentioned band shape as the relative position of mounting body, make the above-mentioned latent electrostatic image developing that is formed on the picture mounting body;
The intermediate transfer body, but the video order stack of all kinds of above-mentioned gained is closed transfer printing on this intermediate transfer body, again with toner on the intermediate transfer body as transfer printing on recording medium;
Fixing device carries out photographic fixing to the uncertain image of transfer printing on recording medium, obtains coloured image; It is characterized in that:
Be provided with speed detector, detect the speed of above-mentioned band shape,, carry out FEEDBACK CONTROL, make above-mentioned band shape become target velocity as the speed of mounting body according to the detected value of above-mentioned speed detector as the mounting body;
Above-mentioned speed detector is configured in the place that the band temperature changes hardly.
(9) in above-mentioned (6)-(8) in any described image processing system, the place that the band temperature of above-mentioned configuration speed pick-up unit changes hardly is the position away from the image processing system endogenous pyrogen.
(10) in the image processing system of above-mentioned (9), above-mentioned thermal source is a fixing device.
(11) in the image processing system of above-mentioned (9), above-mentioned thermal source is an optical writing device.
(12) in the image processing system of above-mentioned (9), above-mentioned thermal source is fixing device and optical writing device.
(13) in above-mentioned (6)-(8) in any described image processing system, above-mentioned speed detector is a roller speed of gyration pick-up unit, detects the speed of gyration of setting up above-mentioned band conveyer or intermediate transfer belt or banded roller as the mounting body.
(14) in the image processing system of above-mentioned (13), above-mentioned roller speed of gyration pick-up unit is a rotary encoder.
(15) in the image processing system of above-mentioned (13) or (14), the roller of above-mentioned roller speed of gyration pick-up unit detection speed is to leave above-mentioned fixing device roller farthest among setting up above-mentioned band conveyer or intermediate transfer belt or banded roller as the mounting body.
(16) in the image processing system of above-mentioned (13) or (14), above-mentionedly comprise removable roller occasion among setting up above-mentioned band conveyer or intermediate transfer belt or banded roller as the mounting body, the roller of above-mentioned roller speed of gyration pick-up unit detection speed is to leave above-mentioned fixing device roller farthest among setting up the roller of above-mentioned band conveyer or intermediate transfer belt or the banded configuration that is fixed as the mounting body.
(17) in the image processing system of above-mentioned (13) or (14), between the roller and above-mentioned band conveyer or intermediate transfer belt or banded driven roller as the mounting body of above-mentioned roller speed of gyration pick-up unit detection speed, the configuration jockey pulley invests above-mentioned band with tension force.
(18) in the image processing system of above-mentioned (14), above-mentioned rotary encoder is configured in the container with air-tight state roughly.
(19) in the image processing system of above-mentioned (6) or (7), be provided with some picture mounting bodies, be configured in and above-mentioned band conveyer or the relative position of intermediate transfer belt, with being formed on as the toner on the mounting body as superimposed transfer printing, can form coloured image transporting by above-mentioned band conveyer on the recording medium of coming or on the intermediate transfer belt.
(20) in the image processing system of above-mentioned (19), be provided with roller speed of gyration pick-up unit, as speed detector, the speed of gyration of the roller of above-mentioned band conveyer or intermediate transfer belt is set up in detection, and the girth of the roller of this roller speed of gyration pick-up unit detection speed and above-mentioned some each ratios as the distance between the mounting body as the mounting body are roughly ratio of integers.
(21) in the image processing system of above-mentioned (13), the employed material of roller that roller speed of gyration pick-up unit is installed has following characteristic: the external diameter expansivity to temperature is below 0.05%.
(22) in the image processing system of above-mentioned (13) or (21), try to achieve " for the 1 degree necessary merit of temperature (J) that rises " according to employed material of roller and quality thereof that roller speed of gyration pick-up unit is installed and be roughly more than 30 (J).
(23) in above-mentioned (13), (21), in (22) any described image processing system, the linear expansion coefficient (1/ ℃) of the material of the roller of installation roller speed of gyration pick-up unit is roughly 25 * 10 -6Below.
(24), in any described image processing system of (21)-(23), the moment of inertia (kgfcm of the roller of roller speed of gyration pick-up unit is installed in above-mentioned (13) 2) be roughly below 35.
(25) in above-mentioned (13), in any described image processing system of (21)-(24), the material that the roller of roller speed of gyration pick-up unit is installed is an aluminium.
(26) in above-mentioned (13), in any described image processing system of (21)-(24), the material that the roller of roller speed of gyration pick-up unit is installed is an iron.
(27) in above-mentioned (13), in any described image processing system of (21)-(24), the material that the roller of roller speed of gyration pick-up unit is installed is a stainless steel.
(28) in above-mentioned (13), in any described image processing system of (21)-(24), the material that the roller of roller speed of gyration pick-up unit is installed is Rhometal (Fe-Ni36%).
(29) in above-mentioned (13), in any described image processing system of (21)-(24), the material that the roller of roller speed of gyration pick-up unit is installed is the material that is made of carbon fiber.
The following describes effect of the present invention.
According to the scheme of the invention described above (1)-(5), can effectively suppress irregular from the toner picture generation concentration that is transferred to as the mounting body on recording medium or the transfer belt, obtain high quality graphic.
Scheme according to the invention described above (6)-(8), be provided with speed detector, detect band conveyer or intermediate transfer belt or banded speed as the mounting body, according to the detected value of speed detector, carry out FEEDBACK CONTROL, make the speed of above-mentioned band become target velocity, and above-mentioned speed detector is configured in the place that the band temperature changes hardly, therefore, can improve the FEEDBACK CONTROL precision, obtain high quality graphic.
According to the scheme of the invention described above (9), the place of configuration speed pick-up unit is the position away from the image processing system endogenous pyrogen, therefore, has got rid of hot influence, can improve the FEEDBACK CONTROL precision.
According to the scheme of the invention described above (10), got rid of the influence of fixing device heat, can improve the FEEDBACK CONTROL precision.
According to the scheme of the invention described above (11), got rid of the influence of optical writing device heat, can improve the FEEDBACK CONTROL precision.
According to the scheme of the invention described above (12), got rid of the influence of fixing device and optical writing device heat, can improve the FEEDBACK CONTROL precision.
According to the scheme of the invention described above (13),, can detect tape speed at an easy rate by the speed of gyration of roller.
According to the scheme of the invention described above (14), by rotary encoder than the high-durability and the high precision that are easier to reach speed detector.
Scheme according to the invention described above (15), the roller of roller speed of gyration pick-up unit detection speed is to leave above-mentioned fixing device roller farthest among setting up above-mentioned band conveyer or intermediate transfer belt or banded roller as the mounting body, the influence of fixing device heat is minimum, can improve the FEEDBACK CONTROL precision.
According to the scheme of the invention described above (16), among the roller of fixed configurations, leave fixing device roller detection speed farthest, speed detector constitutes can be not complicated, and the influence of fixing device heat be minimum, therefore, can improve the FEEDBACK CONTROL precision.
According to the scheme of the invention described above (17), can prevent from the band slippage to take place at the speed test section, can improve accuracy of detection.
According to the scheme of the invention described above (18), rotary encoder is configured in the container with air-tight state roughly, therefore, can prevent influences such as toner in the image processing system or dust, keeps accuracy of detection, prevents fault.
According to the scheme of the invention described above (19), can prevent effectively that the tandem coloured image from forming the color shift of device, can high speed printing, can obtain high-quality image again.
Scheme according to the invention described above (20), the girth of the roller of roller speed of gyration pick-up unit detection speed and each ratio as the distance between the mounting body are roughly ratio of integers, and therefore, there is detection error occasion in roller speed of gyration pick-up unit, position offset of all kinds becomes with amount, can prevent color shift.
According to the scheme of the invention described above (21), the transfer belt velocity variable can be suppressed at below 0.05%, the result, the color shift amount that causes because of velocity variations becomes below 0.05% of distance between picture mounting body.
According to the scheme of the invention described above (22), can prolong the temperature rise time of roller, promptly become the time of tangible color shift, the result, can obtain long-term between stable transfer belt speed, obtain the few good image of color shift between can be long-term.
According to the scheme of the invention described above (23), the linear expansion coefficient (1/ ℃) of the material of the roller of installation roller speed of gyration pick-up unit is roughly 25 * 10 -6Below, the external diameter that can suppress roller expands, the result, can obtain long-term between stable transfer belt speed, obtain the few good image of color shift between can be long-term.
According to the scheme of the invention described above (24), the moment of inertia (kgfcm of the roller of roller speed of gyration pick-up unit is installed 2) be roughly below 35, can keep the FEEDBACK CONTROL performance with low cost, suppress the thermal expansion of roller.
According to the scheme of the invention described above (25), the material that the roller of roller speed of gyration pick-up unit is installed is an aluminium, can realize low-cost and low moment of inertia, therefore, can improve the FEEDBACK CONTROL performance with low cost.
According to the scheme of the invention described above (26), the material that the roller of roller speed of gyration pick-up unit is installed is an iron, can realize cost and the low moment of inertia also lower than aluminium, therefore, can obtain the few good image of color shift for a long time with low cost.
Scheme according to the invention described above (27), the material that the roller of roller speed of gyration pick-up unit is installed is a stainless steel, with the iron phase ratio, can improve the eccentric precision of external diameter, compare with aluminium, can reduce thermal expansion, therefore, can suppress because of the eccentric caused velocity variations of speed measuring roll self, obtain the few good image of color shift between energy is long-term.
According to the scheme of the invention described above (28), the material that the roller of roller speed of gyration pick-up unit is installed is Rhometal (Fe-Ni36%), compares with other materials, can reduce thermal expansion significantly, obtains the few good image of color shift between energy is long-term.
Scheme according to the invention described above (29), the material that the roller of roller speed of gyration pick-up unit is installed is the material that is made of carbon fiber, have the low heat expansion suitable with Rhometal, and compare with other materials, has low moment of inertia, can increase substantially the FEEDBACK CONTROL performance, obtain the few good image of color shift between energy is long-term.
Description of drawings
Fig. 1 is the scrambler key diagram in the image processing system in the past;
Fig. 2 is the summary pie graph of image processing system one example of the direct transfer printing mode of first embodiment of the invention;
Fig. 3 represents picture mounting body shown in Figure 2, backing roll, and relevant pie graph with it;
Fig. 4 is provided in a side of the key diagram of the scrambler on the measuring roll;
Fig. 5 is the front view (FV) of the detection dish of scrambler;
Fig. 6 is the expression measuring roll, the oblique view of the position relation of roll shaft and detection dish;
Fig. 7 is the curve of the offset of expression measuring roll and detection dish;
Fig. 8 is the summary pie graph of image processing system one example of intermediate transfer mode;
Fig. 9 is the summary pie graph of the tandem type color laser printer of second embodiment of the invention;
Figure 10 is an enlarged drawing of representing the transfer printing assembly in detail;
Figure 11 is the temperature variation figure line of expression transfer printing assembly each several part;
Figure 12 is the transfer printing assembly partial section that is used to represent temperature sensor configuration place;
Figure 13 is the mode chart that is used to illustrate the tandem type imaging portion of color shift mechanism;
Figure 14 is the figure line that is used to illustrate color shift mechanism;
Figure 15 is another figure line that is used to illustrate color shift mechanism;
Figure 16 is the transfer printing assembly oblique view that the place is set that is used to represent as the scrambler of tape speed detection means;
Figure 17 is the local oblique view that is used to represent this scrambler formation;
Figure 18 represents that tape speed changes figure line, wherein, Figure 18 A represents that the tape speed that carries out the FEEDBACK CONTROL occasion by this scrambler changes, and Figure 18 B represents that the tape speed that does not carry out the FEEDBACK CONTROL occasion changes, and Figure 18 C is illustrated in different places the tape speed variation that scrambler carries out the FEEDBACK CONTROL occasion is set;
Figure 19 is used to illustrate because scrambler is provided with the mode chart that the place difference causes that the FEEDBACK CONTROL precision is different;
Figure 20 is the summary pie graph of tandem type color laser printer of the intermediate transfer mode of third embodiment of the invention;
Figure 21 is the major part summary pie graph that the coloured image that is provided with banded photoreceptor of fourth embodiment of the invention forms device;
Embodiment
Below, present invention will be described in detail with reference to the accompanying embodiment.
Fig. 2 is the summary pie graph of image processing system one example of the direct transfer printing mode of first embodiment of the invention, is laser printer shown in the figure.This printer is from yellow (following brief note be " Y "), blue or green (following brief note be " C "), and pinkish red (following brief note is " M ") deceives (following brief note is " K ") four look toners formation coloured image.The image processing system here disposes some picture mounting body 3Y in its body 1,3M, and 3C, 3K, each is made of the drum type photoreceptor as the mounting body.Form look different toner picture at each respectively on as the mounting body, in illustrated example, at three picture mounting body 3Y, 3M, the surface of 3C forms yellow tone agent picture respectively, magenta toner picture, cyan toner picture forms the black toner picture on the surface of picture mounting body 3K.Above-mentioned picture mounting body 3Y, 3M, 3C, 3K separate decide to be parallel to each other at interval configuration.
With above-mentioned picture mounting body 3Y, 3M, 3C, 3K disposes the transfer belt 4 that is made of endless belt relatively.Clip this transfer belt 4, at picture mounting body 3Y, 3M, 3C, 3K relative position dispose respectively by transfer roll 11Y, 11M, 11C, the transfer device that 11K constitutes simultaneously, disposes backing roll 12Y, 12M, 12C, 12K respectively near each transfer roll.The transfer belt 4 that is made of endless belt is erected at above-mentioned transfer roll 11Y, 11M, and 11C, 11K, backing roll 12Y, 12M, 12C, 12K, and on the backing roll by other roller 5,6,7,8,9,10 formations.In the present embodiment, the backing roll 7 of one of these backing rolls as driven roller, is driven this backing roll 7 revolutions by CD-ROM drive motor 13,, drive transfer belt 4 and move towards the arrow A direction by these driven roller 7 revolutions.Also can be with some backing rolls as driven roller.Just among some backing rolls with at least one backing roll as driven roller.
Along the moving direction A of transfer belt 4, be positioned at backing roll 8 extruding transfer belt 4 outer peripheral faces in driven roller 7 downstreams, like this, can enlarge transfer belt 4 and roll up the winding angle that hangs on the driven roller 7.The backing roll 9 that is positioned at backing roll 8 downstreams is subjected to spring 26 to compress transfer belt 4 back sides, like this, can invest transfer belt 4 with tension force.
Transfer belt 4 is 10 with for example specific insulation 9～10 11The high resistance ring-type single belt of Ω cm constitutes, and its material can be used for example Kynoar (polyvinylidene fluoride, below brief note is PVDF), above-mentioned transfer belt 4 and relative configuration of above-mentioned picture mounting surface contact.
At each as mounting body 3Y, 3M, 3C, the structure of the last formation of 3K toner picture is identical in fact, only the look difference at this, only describes as mounting body 3Y one of them.Drive this as mounting body 3Y by revolution clockwise shown in Figure 2, at this moment, charge as mounting body 3Y surface by 14 pairs of charging devices, make it charged with decided polarity.Then, the light inlet (being laser L illustrated example) of writing that penetrates from exposure device 15 is radiated on the above-mentioned charged picture mounting body 3Y, forms electrostatic latent image on as mounting body 3Y.By 16 pairs of these latent electrostatic image developings of developing apparatus, but make its videoization, become yellow tone agent picture.
On the other hand, bottom in image forming device body 1, configuration paper feeding cassette 17,18 is on the right side of image forming device body 1, dispose manual paper feed tray 19, from above-mentioned paper feeding cassette 17,18, some recording medium P that constitutes by transfer paper or resin film etc. that sends of manual paper feed tray 19, this recording medium P through 20 revolutions of a pair of registration roller with fixed time send into as mounting body 3Y and the transfer belt 4 that moves along the arrow A direction between, recording medium P is positioned on the transfer belt 4 and is transported.At this moment, to being positioned at the transfer roll 11Y of picture mounting body 3Y subtend position, apply transfer voltage, this transfer voltage polarity is with opposite as the charged polarity of toner of the toner picture on the mounting body 3Y, like this, look like to be transferred on recording medium P as the yellow tone agent on the mounting body 3Y.There is not transfer printing on recording medium P and remain in as the residual toner of transfer printing on the mounting body 3Y and remove by cleaning device 21.
With above-mentioned identical, shown in Figure 2 other as mounting body 3M, 3C, form magenta toner picture on the 3K respectively, cyan toner picture, the black toner picture, these toner pictures are by transfer roll 11M, 11C, the superimposed transfer printing of the sequence of operation of 11K has on the recording medium P of yellow tone agent picture in transfer printing.Like this, recording medium mounting four look secondary colours adjustment picture, after this recording medium P broke away from transfer belt 4, by fixing device 22, at this moment the toner on the recording medium P obtained photographic fixing as Yin Re and pressure effect.Recording medium P by fixing device 22 is discharged in row's paper portion 23 on image forming device body 1 top by direction shown in the arrow B.Recording medium with image surface down state be stacked in the row paper portion 23.
The backing roll 5 that the transfer belt that recording medium P is passed through partly is positioned at upstream side is called the inlet roller, the backing roll 6 that will be positioned at downstream is called outlet roller, at inlet roller 5 places, clip transfer belt 4, configuration Electrostatic Absorption roller 24, as shown in Figure 3, from power supply 25 to Electrostatic Absorption roller 24 apply decide voltage.Like this, the recording medium by this Electrostatic Absorption roller 24, is positioned in reliably on the transfer belt 4 and is transported on transfer belt 4 surfaces by Electrostatic Absorption.
The exposure device 15 of present embodiment is provided with light source, polygonal mirror, and F θ lens, catoptrons etc. shine as the mounting surface with laser scanning according to view data.
Each transfer roll 11Y, 11M, 11C, 11K are provided with materials such as sponge for example by periphery roller constitutes, by metal-cored the apply transfer voltage of power supply (not diagram) to transfer roll.Contact with transfer belt 4 back sides limit revolution of transfer roll limit.
From each as mounting body each transfer position to recording medium transfer printing toner picture, be provided with above-mentioned backing roll 12Y, 12M, 12C, 12K so that recording medium with suitably contact as the mounting body, obtain best transfer printing contact.
The region S of representing with double dot dash line at Fig. 1 disposes useless toner jar, two-sided upset assembly, power supply module etc. (not diagram).
Carriage direction along recording medium, be provided with switching pawl 30 in the downstream of fixing device 22, switch the switching of pawl 30 by this, transport towards the arrow C direction from the recording medium that fixing device comes out, send into after-treatment devices such as sorter or binding apparatus (not diagram), perhaps for two-face printing, through reverse conversion portion, be sent to each as the mounting body by a pair of registration roller once more, from each as the mounting body at recording medium back side transfer printing toner picture, look like to carry out photographic fixing by 22 pairs of these toners of fixing device again, the recording medium P by fixing device 22 is discharged in row's paper portion 23 on image forming device body 1 top.
Remove by band cleaning device 27 shown in Figure 2 attached to the foreign matters such as toner on the transfer belt 4.This band cleaning device 27 is provided with brush roll 28 and cleaning balde 29, and above-mentioned brush roll 28 and cleaning balde 29 contact with transfer belt 4 part outer peripheral faces on being wound on driven roller 7, remove the foreign matter on the transfer belt 4.
As shown in Figure 3, transfer roll 11Y, 11M, 11C and be positioned near it backing roll 12Y, 12M, 12C are bearing on the rocking bracket 32 with freely rotating, and this rocking bracket 32 is bearing on the revolving shaft 31 swingably.Cam 34 is fixed on the camshaft 33, and this cam 34 joins with above-mentioned rocking bracket 32, and towards the revolution of direction shown in the arrow, above-mentioned rocking bracket 32 wraparound rotating shafts 31 are along revolution clockwise by this cam 34.
Inlet roller 5 and Electrostatic Absorption roller 24 are bearing on the inlet carriage 35 with freely rotating, and this inlet carriage 35 can be around axle 36 swings.The hole 37 that is formed on the rocking bracket 32 is chimeric with the pin 38 that is fixed on the inlet carriage 35.If rocking bracket 32 wraparound rotating shaft 31 revolutions as mentioned above, inlet carriage 35 is around the interlock revolution clockwise of axle 36 courts.Like this, by 32,35 revolutions of two carriages, transfer roll 11Y, 11M, 11C and backing roll 12Y, 12M, picture mounting body 3Y leaves in 12C court, 3M, the 3C direction moves, big moving also takes place in inlet roller 5 and Electrostatic Absorption roller 24 towards the below, transfer belt 4 is left picture mounting body 3Y, 3M, 3C.In this state, carry out monochromatic mode, only on picture mounting body 3K, form the black toner picture, again with this monochromatic scheme agent as transfer printing on recording medium.When this monochromatic mode, the recording medium of being transported by transfer belt 4 does not contact as mounting body 3Y, 3M, 3C.These are as mounting body 3Y, and 3M, 3C turn round and also stop, and only drive as mounting body 3K and turn round.
On the other hand, transfer roll 11K and near the backing roll 12K that is positioned at it are bearing on the outlet carriage 39 with freely rotating, and this outlet carriage 39 can be a center steering with outlet roller 6 and concentric shafts 40.As shown in Figure 2, transfer belt 4, support some backing rolls of this transfer belt 4, and band cleaning device 27 constitutes one, become transfer printing assembly 41, image forming device body 1 loading and unloading relatively are when these transfer printing assembly 41 relative image forming device body 1 are loaded and unloaded, as mentioned above, make rocking bracket 32 turn round, make transfer belt 4 leave picture mounting body 3Y, 3M, 3C, simultaneously, operating grip (not diagram) makes outlet carriage 39 towards revolution clockwise, makes transfer roll 11K and backing roll 12K move towards the direction of leaving as mounting body 3K, and transfer belt 4 breaks away from picture mounting body 3K.
At this, in order to prevent from picture mounting body 3Y, 3M, each toner picture generation concentration that 3C, 3K are transferred on the recording medium P is irregular, for the secondary colour that prevents to be transferred on the recording medium P is adjusted as color shift takes place, at least one backing roll is as measuring roll among some backing rolls that transfer belt is used, detect the speed of this measuring roll, controlling and driving motor 13 makes transfer belt speed become necessarily.In illustrated example, backing roll 10 as measuring roll, in the following description, also is called measuring roll 10 with this backing roll sometimes.
As shown in Figure 4, measuring roll 10 is fixedly supported upon on the roll shaft 42, is provided with detected body on this roll shaft 42, and it constitutes with discoideus detection dish 43, and this detected body is with measuring roll 10 revolutions.
In addition, be provided with optical sensor 44 and control device 45, optical sensor 44 comprises light-emitting component and photo detector as detection means one example that detects above-mentioned detected body angular velocity, clips detection dish 43.The detection dish 43 of present embodiment is made of transparent panel, as shown in Figure 5, on this detection dish 43, forms many detection line SL along circumferential equal angles compartment of terrain.Detection dish 43 when the hyalomere between the detection line SL is between light-emitting component and photo detector, is injected photo detector from the light that light-emitting component penetrates with measuring roll 10 revolutions.When detection line SL was between light-emitting component and photo detector, the light that penetrates from light-emitting component was interdicted by this detection line SL, does not inject photo detector from the light that light-emitting component penetrates.Like this, detection dish 43 and optical sensor 44 constitute scrambler.According to the testing result of the detection means that is made of optical sensor 44, from control device 45 output control signals, controlling and driving motor 13 makes the speed of transfer belt 4 become target velocity.Like this, control makes the angular velocity of detection dish 43 become necessarily, can control to make the speed of transfer belt 4 keep certain.
Here, structure more shown in Figure 4 in detail and structure shown in Figure 1.
In image processing system shown in Figure 4, assembling measuring roll 10, detection dish 43 and roll shaft 42 make that all relative roll shaft 42 of measuring roll 10 and detection dish 43 is concentric; And in image processing system shown in Figure 1, assemble, make that measuring roll 10 relative roll shafts 42 are concentric, and the also relative roll shaft 42 of bolster 61 is concentric, detection dish 43 relative bolsters 61 are concentric.But, in fact, make assembling and make that above-mentioned is very difficult with one heart all.
In image processing system shown in Figure 4, the central axis X 1 of measuring roll 10 relative its roll shafts 42 has off-centre slightly, and perhaps how many central axis X 1 of detection dish 43 relative roll shafts 42 has off-centre, generally is difficult to avoid.In Fig. 4, above-mentioned off-centre is used δ 1 respectively, δ 2 expressions.In image processing system shown in Figure 1, the central axis X 1 of measuring roll 10 relative roll shafts 42 has off-centre slightly, perhaps how many central axis X 2 of detection dish 43 relative bolsters 61 has off-centre, and the central axis X 1 of the central axis X 2 relative roll shafts 42 of bolster 61 has off-centre slightly, generally is difficult to avoid.In Fig. 1, above-mentioned off-centre is used δ 1 respectively, and δ 2, δ 3 expressions.
If there is this off-centre, because this off-centre, detection is coiled 43 and is circled for every time, and speed changes, and detects these velocity variations by optical sensor 44, and 13 revolutions of controlling and driving motor are to eliminate velocity variations.
But, measuring roll 10 is not driven roller but driven voller occasion, based on above-mentioned each eccentric velocity variations that takes place, eliminate this velocity variations if control, the velocity variations of transfer belt 4 then takes place on the contrary, if let alone this phenomenon, then adjust as color shift can take place as the secondary colour that the mounting body is transferred on the recording medium from each.Because of measuring roll 10, detection dish 43, the off-centre of backing roll 61 and the velocity variations of the detection dish 43 that causes, surveyed the velocity variations that does not have the transfer belt 4 of generation for actual by flase drop, according to the speed of this flase drop observing and controlling system transfer belt 4, color shift can take place in the result on the coloured image of finishing.
Even measuring roll is the driven roller occasion, based on the off-centre of detection dish 43 and bolster 61, velocity variations takes place in detection dish 43, detects the velocity variations of detection dish 43, and the speed according to this testing result control transfer belt 4 is certain, and this occasion too.
So, in the image processing system of present embodiment, as shown in Figure 3, be made as LA as the toner on the mounting body as transfer printing distance between the transfer printing between the transfer position TP on the recording medium with adjacent to each other, the girth of measuring roll 10 is set between above-mentioned transfer printing roughly integer/one apart from LA.By adopting this structure, can prevent that the secondary colour adjustment picture of transfer printing on recording medium P from color shift taking place.
But said structure does not have to eliminate the velocity variations based on the detection dish 43 of each off-centre, therefore, only adopts this structure, can not remove from picture mounting body 3Y, and it is irregular that 3M, 3C, 3K are transferred to the concentration of each the monochromatic scheme agent picture on the recording medium P.This concentration is irregular along with above-mentioned each eccentric accumulation, and is more and more significant.Therefore, image processing system is such as shown in Figure 1, roll shaft 42 is connected with bolster 61 by shaft coupling 60, as if fixed test dish 43 on bolster 61, the eccentric relatively δ 1 of eccentric δ 3 of bolster 61 relative roll shafts 42, δ 2 piles up, whole offset is big, from picture mounting body 3Y, 3M, 3C, 3K are transferred to each toner picture on the recording medium P, and that concentration easily takes place is irregular.
And in the image processing system as shown in Figure 4 of present embodiment, the detected body that is made of detection dish 43 directly is fixed on the roll shaft 42, therefore, compares with image processing system in the past, and eccentric accumulation is few, and it is irregular to suppress that effectively concentration takes place.That is, though measuring roll 10 relative roll shaft 42 off-centre, and detection dish 43 relative roll shaft 42 off-centre, but compare with image processing system in the past, whole offset is little.Therefore, because this off-centre, the speed of detection dish 43 changes, it is the velocity variations that does not in fact have the transfer belt of generation that this velocity variations flase drop is surveyed, according to this testing result, and the revolution of controlling and driving motor 13, to eliminate the velocity variations of this detection dish 43, even carry out above-mentioned control, from each as mounting body 3Y, 3M, 3C, it is seldom irregular that 3K is transferred to the concentration that each the toner picture on the recording medium P taken place, few to the degree that can ignore, can improve the quality of the coloured image of finishing.Have again, can save shaft coupling, reduce the part number, reduce assembling operation, reduce cost.
Irregular in order further to reduce above-mentioned concentration, need to reduce the semi-invariant of the eccentric δ 2 of the eccentric δ 1 of central axis X 1 of above-mentioned measuring roll 10 relative roll shafts 42 shown in Figure 4 and detection dish 43.For this reason, improve measuring roll 10, the manufacturing accuracy of roll shaft 42 and detection dish 43, though preferably eliminate above-mentioned each eccentric δ 1 in fact, δ 2, its manufacturing cost rises.
So, as shown in Figure 6, the circumferential position of the maximum radius portion of the central axis X 1 of measuring roll 10 relative roll shafts 42 is made as E1, the circumferential position of the least radius portion of the central axis X 1 of the relative roll shaft 42 of detected body that is made of detection dish 43 is made as E2, make above-mentioned E1, the E2 position is under the state circumferential unanimous on the whole of measuring roll 10 and detection dish 43, detection dish 43 is fixed on the roll shaft 42, like this, even each eccentric δ 1, δ 2 is big, but owing to cancel each other, its eccentric semi-invariant is little, and it is irregular effectively to suppress image color, and it is suppressed to the degree that can ignore.Also can be so that the circumferential position of the maximum radius portion of the central axis X 1 of the relative roll shaft 42 with detected body of circumferential position of the least radius portion of the central axis X 1 of measuring roll 10 relative roll shafts 42 is unanimous on the whole, in this state, detected body is fixed on the roll shaft 42, also can obtains above-mentioned same effect.
As mentioned above, 42 pairs of detection dishes 43 of roll shaft position relatively, implement assembling, can adopt for example following method.
Measuring roll 10 is fixed on the roll shaft 42 integratedly, detection dish 43 is fitted on the above-mentioned roll shaft 42, relative roll shaft 42, temporary fixed should detection dish 43.Then, make measuring roll 10, roll shaft 42 and detection dish 43 turn round together, show the output of optical sensor 44 at this moment.Shown in Fig. 7 A-7D, transverse axis is represented the circumferential position of measuring roll 10 and detection dish 43, and the longitudinal axis is represented offset.As mentioned above, the off-centre of the measuring roll 10 when detection dish 43 is temporarily fixed on the roll shaft 42 represents that with the solid line of Fig. 7 A the off-centre of detection dish 43 represents that with the dotted line of Fig. 7 A it accumulates eccentric state representation in Fig. 7 B.Velocity variations by the pairing detection dish 43 of the optical sensor 44 above-mentioned eccentric states of detection shows this variation.
Then, make 43 relative roll shaft 42 revolutions of detection dish to change the relative angular position of detection dish, show the output of the optical sensor 44 of this moment for roll shaft 42.
Above-mentioned operation is carried out repeatedly, seeks the position of the detection dish 43 of amplitude of wave form minimum shown in Fig. 7 B, that is, detection dish 43 is for the relative angular position of roll shaft 42.For example, search out the position of the detection dish 43 of the amplitude of wave form hour shown in Fig. 7 D,, detection dish 43 relative roll shafts 42 are carried out finally fixing with for example cementing agent in this position.
By said method, can reduce eccentric semi-invariant, still, when detection dish 43 is fixed on the roll shaft 42, must seeks detection and coil the right position of relative roll shaft 42 and put, this operation more or less bothers.So the present invention considers to adopt following method,, can more simply detection dish 43 relative roll shafts 42 be fixed on correct position by using this method.
Use the same material same procedure to produce detection in enormous quantities and coil 43 occasions, the least radius portion and the maximum radius portion that are assembled into the relative roll shaft of each the detection dish 43 before the roll shaft 42 all are in same position.Therefore, detect once its least radius portion or maximum radius portion, the least radius portion of the specific whole detection dishes of energy or the position of maximum radius portion.So, as shown in Figure 6, to whole detection dishes, in advance in its least radius portion or the maximum radius standard laid down by the ministries or commissions of the Central Government with mark M1.
On the other hand, measure the maximum radius portion or the least radius portion of the central axis X 1 of measuring roll 10 relative roll shafts 42, its position also is marked with mark M2 as shown in Figure 6 in advance at every turn.And, when being assembled into the detection dish on the roll shaft 42, making above-mentioned mark M1, the circumferential position unanimity of M2 then, should be fixed on the roll shaft 42 by detection dish 43 by cementing agent etc.For example, in advance in the least radius standard laid down by the ministries or commissions of the Central Government of detection dish 43 with mark M1, with mark M2, make above-mentioned mark M1 in the maximum radius standard laid down by the ministries or commissions of the Central Government of measuring roll 10, M2 is fixed to detection dish 43 on the roll shaft 42 after the circumferential position unanimity.Perhaps in advance in the maximum radius standard laid down by the ministries or commissions of the Central Government of detection dish 43 with mark M1, with mark M2, make above-mentioned mark M1 in the least radius standard laid down by the ministries or commissions of the Central Government of measuring roll 10, M2 is fixed to detection dish 43 on the roll shaft 42 after the circumferential position unanimity.
Solid line among Fig. 7 C is represented the offset of measuring roll 10, and dotted line is represented the offset of detection dish 43, makes mark M1, the M2 position consistency, and shown in Fig. 7 D, two eccentric counteractings can reduce its eccentric semi-invariant.
As mentioned above, with mark M1, the suitable position that can simply detected body be assembled in relative roll shaft is fixed in the least radius portion of relative roll shaft 42 central axis X 1 of detected body or the maximum radius standard laid down by the ministries or commissions of the Central Government.
The image processing system that structure of the present invention is applicable to direct transfer printing mode has been described above, promptly, will be at each as mounting body 3Y, 3M, 3C, the toner that 3K forms is being positioned in the image processing system that obtains document image on the recording medium of transporting on the transfer belt 4 as superimposed transfer printing, but structure of the present invention also is applicable to the image processing system of intermediate transfer mode, that is, will be at each toner that forms on as the mounting body as superimposed transfer printing at the image processing system that again this toner is obtained document image on the transfer belt as transfer printing on recording medium.
Fig. 8 represents image processing system one example of intermediate transfer mode.The image processing system here is identical with image processing system shown in Figure 2, is at some picture mounting body 3Y, 3M, 3C, the toner picture of the last formation of 3K look inequality.Transfer belt 4 be configured in each as mounting body 3Y, 3M, 3C, the position of 3K subtend, be erected at roller 5,6,7 and by transfer roll 11Y, 11M, on some backing rolls that 11C, 11K constitute, be driven along the arrow A direction and move, above-mentioned toner as superimposed transfer printing on above-mentioned transfer belt 4.At least one backing roll is as driven roller in some backing rolls, and backing roll 5 is driven rollers in Fig. 8 example, drives this driven roller 5 revolutions by CD-ROM drive motor (not diagram), moves thereby drive transfer belt 4.Send recording medium P from paper feeding cassette 17, send between transfer belt 4 and the transfer roll 46 as secondary transfer printing device one example through a pair of registration roller 20, the toner picture on the transfer belt 4 passes through these transfer roll 46 transfer printings on recording medium P.By the intermediate transfer belt after being with cleaning device 27 cleaning toners as transfer printing.The recording medium that transfer printing has a toner picture is by fixing device 22, at this moment this toner as photographic fixing on recording medium P.Recording medium P by fixing device 22 is discharged to paper portion 23.Above-mentioned image processing system also can adopt above-mentioned Fig. 4-each structure shown in Figure 7.
Have, the present invention also can be applicable to following image processing system again: form monochromatic scheme agent picture on a picture mounting body, this toner is obtained document image as transfer printing being positioned on the recording medium that is transported on the transfer belt.
Have again, the present invention also can be applicable to following image processing system: one as the mounting body on order form the toner picture of look inequality, this each toner is being positioned on the recording medium that is transported on the transfer belt as superimposed transfer printing, perhaps superimposed transfer printing is adjusted this secondary colour and is obtained document image as transfer printing on recording medium on transfer belt.
As mentioned above, the present invention can be suitable for following image processing system: be provided with at least one as the mounting body, form the toner picture at this on as the mounting body, the toner that will form on as the mounting body is being positioned in as transfer printing on the recording medium that is transported on the transfer belt, perhaps transfer printing obtains document image with this toner as transfer printing again on recording medium on transfer belt.
Fig. 9 is the summary pie graph of the tandem type color laser printer of second embodiment of the invention.
It is paper feeding cassette 103,104 that the device body bottom of this laser printer is provided with sheet feed section, is configured to picture portion above it, and paper platform 108 is promptly arranged by configuration row paper portion on device body.As shown in phantom in FIG. recording chart transport passage, supply with paper from sheet feed section, imaging portion with formed image transfer printing on paper, after fixing device 107 photographic fixing, row is to row's paper platform 108.
In imaging portion, be provided with transfer printing assembly 106, its tilted configuration, paper supply side down, paper discharging side is up.The limit is moved on top along the transfer printing moving belt 150 of this transfer printing assembly, and series arrangement is provided with four image-forming assembly 101M, 101C, 101Y, 101K from the bottom up.Above-mentioned image-forming assembly 101M, 101C, 101Y, 101K are respectively equipped with as photoconductor drum 111M, 111C, 111Y, 111K and developing device as the mounting body.
It is parallel that each image-forming assembly is configured to each photoconductor drum revolving shaft, and dispose with institute's determining deviation along the transfer paper moving direction.
The laser printer of present embodiment is provided with light and writes assembly 102, a pair of registration roller 105, manual paper feed tray MF, toner supply container TC etc.Above-mentioned light writes assembly 102 and comprises light source, polygonal mirror, and f-θ lens and catoptron etc., according to view data, laser is to each photoconductor drum 111M, 111C, 111Y, the irradiation of 111K surface scan.
Figure 10 is that the summary of transfer printing assembly 106 constitutes enlarged drawing, and the transfer printing moving belt 150 that uses at this transfer printing assembly 106 is that specific insulation is 10 9～10 11The high-resistance ring-type single belt of Ω cm, its material is used PVDF.Also can use for example good PI (polyimide) of extensibility etc. of other material as the material of band.Above-mentioned transfer printing moving belt 160 is erected on the backing roll 161-168, by with the photoconductor drum 111M of each image-forming assembly, 111C, 111Y, each transfer position of 111K contact subtend.
Among above-mentioned these backing rolls, at the inlet roller 161 of transfer paper moving direction upstream side, configuration Electrostatic Absorption roller 180, it is relative with above-mentioned inlet roller 161, is configured in the outer peripheral face of transfer printing moving belt 150, from power supply 180a apply decide voltage.By the transfer paper between inlet roller 161 and the Electrostatic Absorption roller 180 by Electrostatic Absorption on transfer printing moving belt 150.Roller 163 is the driven rollers that are used for friction-driven transfer printing moving belt 150, is connected with drive source (not diagram), turns round towards the direction of arrow.
In each transfer position, form means as the transfer electric field that is used to form transfer electric field, be provided with transfer bias and apply parts 167M, 167C, 167Y, 167K, with the photoconductor drum relative position, contact with the back side of transfer printing moving belt 150.Above-mentioned transfer bias applies parts 167M, and 167C, 167Y, 167K are the bias voltage rollers that sponge etc. is set in periphery, from each transfer bias power supply 109M, and 109C, 109Y, 109K is to the metal-cored transfer bias that applies of roller.By the effect of this transfer bias, the transfer printing electric charge is invested transfer printing moving belt 150, in each transfer position, the transfer electric field of intensity that formation is decided between photoconductor drum surface and transfer printing moving belt 150.Also be provided with backing roll 168,, make transfer paper keep suitable contacting, obtain best transfer printing contact with photoreceptor so that in above-mentioned zone of carrying out transfer printing.
Above-mentioned transfer bias applies parts 167M, 167C, 167Y, 167K and dispose nigh backing roll 168 be bearing in integratedly can rotating carriage 193 on, can be center steering with revolving shaft 194.Cam 196 is fixed on the camshaft 197, and towards direction of arrow revolution, above-mentioned transfer bias applies parts 167M by cam 196,167C, 167Y, 167K and backing roll 168 be integral towards revolution clockwise.
Above-mentioned inlet roller 161 and adsorption roller 180 are bearing on the inlet roll bracket 190 integratedly, can be the center with axle 191, from state court shown in Figure 10 revolution clockwise.Rocking bracket 193 is provided with hole 195, and pin 192 is fixed on inlet roll bracket 190, chimeric by above-mentioned pin 192 and hole 195, and above-mentioned inlet roll bracket 190 turns round with the revolution interlock of rocking bracket 193.By the clockwise revolution of above-mentioned inlet roll bracket 190 with rocking bracket 193, above-mentioned transfer bias applies parts 167M, 167C, 167Y, 167K and backing roll 168 leave photoconductor drum 111M, 111C, 111Y, above-mentioned inlet roller 161 and adsorption roller 180 also move towards the below.Only form black toner as the time, can avoid photoconductor drum 111M, 111C, 111Y contacts with transfer printing moving belt 150.Promptly, in the present embodiment, the colour print occasion keeps transfer printing moving belt 150 and four look image-forming assembly 101M, 101C, 101Y, the photoconductor drum 111M of 101K, 111C, 111Y, 111K state of contact, black monochrome are printed occasion, keep transfer printing moving belt 150 only with the photoconductor drum 111K state of contact of image-forming assembly 101K.
On the other hand, transfer bias applies parts 167K and near backing roll 168 and is bearing in pivotally on the outlet carriage 198, can with the coaxial axle 199 of outlet roller 162 be center steering.During the relative bodies loading and unloading of transfer printing assembly 106,, make it, make transfer bias apply parts 167K and near backing roll 168 leaves the photoconductor drum 111K that black image forms usefulness towards revolution clockwise by operating grip (not diagram).
At the outer peripheral face of the transfer printing moving belt 150 of coiling driven roller 63, configuration cleaning device 185 (Fig. 9), it is made of brush roll and cleaning balde, removes attached to the foreign matters such as toner on the transfer printing moving belt 150 by this cleaning device 185.
Along the moving direction of transfer printing moving belt 150, in the downstream of driven roller 163, roller 164 is set being pressed into transfer printing moving belt 150 outer peripheral face directions, extruding transfer printing moving belt 150 is guaranteed the winding angle on driven roller 163 of transfer printing moving belt 150.In the ring of the transfer printing moving belt 150 in downstream more, jockey pulley 165 is set, by spring 169 as push part, give and band with tension force.
In Fig. 9, dot the passage that transports of transfer paper 200.Supply with transfer paper 200 from paper feeding cassette 103,104 or manual paper feed tray MF, transported guide (not diagram) guiding, transport, stop for the moment at a pair of registration roller 105 with transporting roller.A pair of registration roller 105 fix time and send transfer paper 200, be positioned on the transfer printing moving belt 150, towards each image-forming assembly 101M, 101C, 101Y, 101K transport, by each transfer printing contact site.
At each image-forming assembly 101M, 101C, 101Y, the photoconductor drum 111M of 101K, 111C, 111Y, each the toner picture that is developed on the 111K are subjected to the superimposed transfer printing of effect of transfer electric field and contact pressure on transfer paper 200 at each transfer printing contact site respectively.By above-mentioned superimposed transfer printing, on transfer paper 200, form the color toner picture.Remove the photoconductor drum 111M of toner after by cleaning device as transfer printing, 111C, 111Y, the surface of 111K, after this electricity that disappears again forms electrostatic latent image fully.
On the other hand, the transfer paper 200 that is formed with the color toner picture fixing device 107 with this color toner as photographic fixing on transfer paper 200, then corresponding with the turn state that switches guide G, towards the first row paper direction B or second row's paper direction C.Be discharged to occasion on the paper platform 108 from first row's paper direction B, image surface is banked up down.Discharge occasion from second row's paper direction C, send into after-treatment devices such as sorter or binding apparatus (not diagram), perhaps for two-face printing, through reverse conversion portion, once more by a pair of registration roller 105.
Outlet roller 162 adjacency at transfer printing assembly 106 dispose fixing device, and therefore, transfer printing assembly 106 is subjected to the influence of the heat of fixing device 7.Certainly, be subjected to fixing device 7 the heat affecting maximum be immediate outlet roller 162 parts.
At this, the elongation about the temperature variation of transfer printing moving belt 150 and the band that causes thus illustrates the test that the inventor does.
Outlet roller 162 is a solid metal roller occasion, in the each several part demonstration temperature variation as shown in figure 12 of transfer printing assembly 106.Configuration place of temperature sensor as shown in figure 11, temperature sensor S1 is configured in outlet roller 162 places, temperature sensor S2 is configured in driven roller 163 places, and temperature sensor S3 is configured between outlet roller 162 and the driven roller 163, and temperature sensor S4 is configured between image-forming assembly 101C and the 101Y.
In Figure 12, the longitudinal axis is represented temperature, transverse axis express time (branch).As shown in the figure, after the image processing system starting, carry out the initial treatment of each several part, form by the image from 1 to 100, transfer printing moving belt 150 transports recording chart.Then, clock time standby (placement) in about 30 minutes by number (20 s') that formation is decided image, is transported recording chart once more.
At this moment, temperature variation in temperature sensor S1 portion is represented with solid line, temperature variation in temperature sensor S2 portion is represented with double dot dash line, represents with dot-and-dash line in the temperature variation of temperature sensor S3 portion, dots in the temperature variation of temperature sensor S4 portion.
Place after 30 minutes, when carrying out image formation again, shown in the scope that is surrounded with ellipse among the figure, at the each several part of transfer printing assembly 106, temperature variation is different.Certainly, this phenomenon is not limited to 30 minutes standing times, even standing time more or less, all this phenomenon can take place.
When the recording chart after starting transported, because transfer printing moving belt 150 starting back is moved (revolution) continuously, the Temperature Distribution of circumferential direction became roughly homogeneous state, the temperature variation of the each several part under this state identical (in reference to Figure 11 10-20 minute).But, if image forms temporary transient end, place a period of time, this transfer printing moving belt 150 rises obviously in the temperature of outlet roller 62 sides (sensor S1, the place of S3), begins to form the image occasion once more, and is different in the temperature variation tendency of each one.Therefore, transfer printing moving belt 150 local elongation amount differences, like this, the image transfer printing starting position of transfer printing moving belt 150 changes because of elongation, and the transfer position skew can take place, thereby color shift takes place.
Figure 13 is the mode chart that is used to illustrate the tandem type imaging portion of color shift mechanism, as shown in figure 13, one side along transfer printing moving belt 150, with uniformly-spaced (being 100mm in the present embodiment) configuration each as mounting body 111M, 111C, 111Y, 111K occasion, the transfer paper travelling speed is made as 100mm/sec, from magenta being used carry out after writing one second as mounting body 111M cyan is used writing as mounting body 111C.Equally, yellow is used as the writing of mounting body 111Y, black is used writing as mounting body 111Y from magenta being used carry out after writing three seconds as mounting body 111M from magenta being used write to carry out after two seconds as mounting body 111M.
When the 150 local nothing elongations of transfer printing moving belt, with the normal mobile occasion of certain speed (standard speed), can be correctly superimposed from the photoconductor drum toner picture of all kinds of using of all kinds, color shift can not take place, still, when transfer printing moving belt 150 local elongations, tape speed changes occasion, at this, shown in Figure 14 A, figure line when solid line NO represents just often to be standard speed 100mm/sec, the figure line when dot-and-dash line FO represents to take place velocity variations with 99mm/sec.As shown in Figure 14B, reduce the accumulation position, though from figure line, not obvious with the difference of standard speed, if amplify, then to compare with standard speed as can be known, reduce the accumulation position.Shown in Figure 14 C, along with the time, the shift in position amount increases.
If local elongation does not take place in band, then shown in Figure 15 A, do not change from the distance on the paper top of each color image, can be correctly superimposed, color shift does not take place.And the local elongation occasion takes place when band, and then shown in Figure 15 B, change from the distance on the paper top of each color image, shown in Figure 15 C, when being benchmark with black, other three color bits is equipped with variation, and color shift takes place in superimposed image occasion of all kinds.
Like this, after placement is the standby certain hour, begin to form the image occasion again, outlet roller portion temperature rises, and in the present embodiment, places 30 minutes, and the color shift about 100 μ m takes place the result.
So, in the laser printer of present embodiment, detecting the translational speed of transfer printing moving belt 150, detected tape speed of comparison operation and target velocity are the poor of standard speed, carry out FEEDBACK CONTROL, make transfer printing moving belt speed become target velocity.And, in order to carry out FEEDBACK CONTROL, detect the translational speed of transfer printing moving belt 150, the place of detecting transfer printing moving belt 150 translational speeds is set in the place that the band temperature variation takes place hardly.Like this, can improve the FEEDBACK CONTROL precision, effectively prevent image processing system generation color shift.
Material as the speed measuring roll of tape speed detection means adopts low thermal expansion material, makes shape hang down moment of inertiaization, has high FEEDBACK CONTROL performance, keeps stabilized speed between can be long-term, the result, can provide for a long time between the stable little image of color shift.
Below, the FEEDBACK CONTROL of transfer printing moving belt 150 of the laser printer of present embodiment is described.
Figure 16 is the transfer printing assembly oblique view that the place is set that is used to represent as the scrambler of tape speed detection means, as shown in figure 16, in the laser printer of present embodiment, be the scrambler 120 that is provided as the tape speed detection means on the bottom right roller 166 at a certain roller of the transfer printing moving belt 150 that sets up transfer printing assembly 106.This bottom right roller 166 is positioned at and leaves the far position of photographic fixing assembly 107, is the place that the temperature variation of band takes place hardly, and above-mentioned photographic fixing assembly is a thermal source, produces very big heat in printer.In device, except the photographic fixing assembly, the thermal source that produces very big heat also has light to write assembly 102.But bottom right roller 166 leaves light, and to write assembly 102 also far, and the influence that light writes assembly 102 also is difficult for reaching, and is the place that the temperature variation of band takes place hardly.Therefore, when using usually, the temperature of bottom right roller 166 rises very little.But, long-term between printing occasion continuously, because of the temperature of bottom right roller 166 rises, the speed of transfer printing moving belt 150 increases.
Figure 17 is used for the local oblique view that presentation code device 20 constitutes, as shown in figure 17, on the axle 166a of bottom right roller 166 by preceding being pressed into lining 122, after be pressed into lining 123, shaft collar 121 coils 121 both sides at this, configuration light-emitting component 124, photo detector 125.Many slits (not diagram) equally spaced are set on dish 121, and the light that sends by slit from light-emitting component 124 reaches photo detector 125.Time per unit, according to the umber of pulse of photo detector 125 outputs, the speed of gyration that detects bottom right roller 166 is the speed of transfer printing moving belt 150.In the present embodiment, as shown in figure 16, each member storage that constitutes scrambler can prevent influences such as heat or dust in housing 126.
The roller of configuration codes device 20 is not limited to the bottom right roller, in the present embodiment, because inlet roller 161 removable (swing) therefore, is set bottom right roller 166 as the stationary roll that is used to be provided with scrambler.
FEEDBACK CONTROL itself is a known technology, describe in detail and omit, be imported into (the not diagrams) such as control parts that control device for example is used to control printer body from the output of scrambler 20, control is used to drive the motor 170 of above-mentioned driven roller 163, makes transfer printing moving belt 150 become target velocity.
When describing the roller 166 temperature rising of above-mentioned bottom right below in detail, the speed of transfer printing moving belt 150 increases.
Use scrambler to carry out the FEEDBACK CONTROL occasion, according to the signal from scrambler, adjust the pulse of CD-ROM drive motor 170, make angle of revolution speed become necessarily, maintenance speed is certain.The angle of revolution speed omega, the transfer belt speed v, speed measuring roll (being bottom right roller 166 in the present embodiment) radius r has following relation: ω=v/r, therefore, if the thermal expansion of speed measuring roll, i.e. r → r1, r＜r1 then keeps ω certain in order to control, increase the transfer belt speed v, i.e. v → v1, v＜v1.
Therefore, in the present invention,, consider its material and formation in order to do one's utmost to reduce the expansion of speed measuring roll.In order to reduce the influence of thermal expansion, need take:
(1) the low material of selection wire expansion coefficient.
(2) increase for the 1 degree necessary merit of temperature (J) that rises, above-mentioned merit can be from the specific heat of this material, density, and use amount (quality) is tried to achieve.
But if the big person of a large amount of use density, though very effective to thermal expansion, in the present embodiment, as the roller use occasion that scrambler is set, moment of inertia increases, and can not follow the tracks of small velocity variations, and is unsatisfactory.Therefore, when doing one's utmost to reduce thermal expansion influence, also must suppress moment of inertia, otherwise obtain stable transfer belt speed between can not be for a long time.
Below in the table 1 expression when the material wall thickness of change speed measuring roll, the variation of " 1 spending the necessary merit of temperature (J) " and moment of inertia for rising.In table 1, (thermal expansion alloy: during invar) as material, in fact external diameter expansivity minimum, is taken all factors into consideration cost and machinery and is required performance etc. to select to use INVAR.
Table 1A
1.5mm roller (benchmark) 2.0mm roller 2.5mm roller 3.0mm roller
Wall thickness (mm) ?1.5 ?2.0 ?2.5 ?3.0
Floorage (mm 2) ?65.9734 ?84.8230 ?102.1018 ?117.8097
Volume (mm 3) ?20121.9009 ?25871.0155 ?31141.0372 ?35931.9660
Material ?al ?al ?al ?Al
Density (kg/mm 3) ?2770 ?2770 ?2770 ?2770
Specific heat (J/kg ℃) ?875 ?875 ?875 ?875
Linear expansion coefficient (1/ ℃) ?0.000023 ?0.000023 ?0.000023 ?0.000023
Roller quality (g) ?55.73766562 ?71.66271294 ?86.26067299 ?99.53154575
For the 1 degree necessary merit of temperature (J) that rises ?48.77045742 ?62.70487382 ?75.47808886 ?87.09010253
The linear expansion coefficient of relative datum roller 0.000023 ?0.000018 ?0.000014862 ?0.000012880
The external diameter expansivity of relative datum roller 1.000 ?0.778 ?0.646 ?0.560
Moment of inertia (kgfcm 2) 12.3 ?13.3 ?15.7 ?16.4
Table 1B
There is not dirty roller 0.8mm roller 1.5mm roller 0.8mm roller
Wall thickness (mm) 7.75 ?0.8 ?1.5 ?0.8
Floorage (mm 2) 188.6919 ?36.9451 ?65.9734 ?36.9451
Volume (mm 3) 57551.0322 11268.2645 ?20121.9009 11268.2645
Material al ?Fe ?Fe ?INVAR
Density (kg/mm 3) 2770 ?7850 ?7850 ?8000
Specific heat (J/kg ℃) 875 ?434 ?434 ?450
Linear expansion coefficient (1/ ℃) 0.000023 ?0.000012 ?0.000012 ?0.000001
Roller quality (g) 159.4163591 ?88.45587656 ?157.9569224 ?90.14611624
For the 1 degree necessary merit of temperature (J) that rises 139.4893142 ?38.38985043 ?68.55330433 ?40.56575231
The linear expansion coefficient of relative datum roller 0.000008 ?0.000015 ?0.000009 ?0.000001
The external diameter expansivity of relative datum roller 0.350 ?0.663 ?0.371 ?0.052
Moment of inertia (kgfcm 2) 19.1 ?19.2 ?31.3 ?19.5
Figure 18 represents that tape speed changes figure line, Figure 18 A represents to detect by the scrambler 120 that is located at bottom right roller 166 speed of transfer printing moving belt 150, the tape speed that carries out the FEEDBACK CONTROL occasion changes figure line, tape speed to scrambler 120 output carry out integration and get, wherein, the longitudinal axis is represented variable quantity, the transverse axis express time.
Shown in Figure 18 A, beginning (the 150 revolution beginnings of transfer printing moving belt) back revolution is highly stable, therefore, color shift does not take place.
The tape speed that Figure 18 B represents not carry out the FEEDBACK CONTROL occasion changes, in Figure 18 B, after the beginning 40 second variable quantity big, color shift takes place.Along with effluxion, variable quantity reduces, and is in steady state (SS) in 40 seconds later on.
Figure 18 C is illustrated in outlet roller 162 places the tape speed variation that scrambler carries out the FEEDBACK CONTROL occasion is set, and the figure line of Figure 18 C is compared with Figure 18 B, and variable quantity is little, but compare with Figure 18 A, after the beginning 40 second variable quantity big, along with effluxion, variable quantity reduces, and is in steady state (SS) in 40 seconds later on.
Like this, according to the present invention, in the place that the thermal source influence does not almost have, promptly the place that takes place hardly of Dai temperature variation is provided with the tape speed detection means, carry out FEEDBACK CONTROL, improve the FEEDBACK CONTROL precision, can prevent the color shift in the tandem image processing system effectively.
Even the accumulation of heat gradually of speed measuring roll, but owing to adopt the material-structure (wall thickness) that is not subject to its influence, the transfer belt speed that causes because of the measuring roll thermal expansion in the time of suppressing FEEDBACK CONTROL increases, and can prevent the color shift in the tandem image processing system effectively.In addition, the variation by material or structure (wall thickness) can realize cost degradation, high precision int, and therefore low moment of inertiaization, can use different schemes respectively according to mechanical purposes.
The tandem image processing system can be extraordinary mode on high speed printing, but also have many problems on high image quality with the short time formation coloured image roughly the same with black white image, especially, is difficult to prevent color shift.But, according to the present invention, by the transfer printing moving belt being implemented the good FEEDBACK CONTROL of precision, can high speed printing, can prevent color shift again, can in the short time, obtain the high coloured image of picture quality.
Can be applicable to also that in the FEEDBACK CONTROL to the transfer printing moving belt of the present invention monochrome image forms device, still, as mentioned above, especially effective to preventing color shift in the tandem image processing system.
Figure 19 is used to illustrate because scrambler is provided with the mode chart that the place difference causes that the FEEDBACK CONTROL precision is different.
In the laser printer of formation shown in Figure 9, as shown in figure 19, outlet roller 162 is subjected to the heat affecting (dotting part in the diagram roller) of photographic fixing assembly 107, and this heat is delivered to transfer printing moving belt 150, and like this, transfer printing moving belt 150 local elongation amounts change.This variable quantity is different because of load influence, in Figure 19, represents that with dot-and-dash line the ratio of elongation double dot dash line of part represents that part is big.In the scope of joining with driven roller 163, by driven roller 163, transfer printing moving belt 150 is that datum velocity moves with institute's constant speed degree.
Outlet roller 162 is owing to the influence that is subjected to representing with double dot dash line the band elongation of part, to be driven than the slow some speed of datum velocity.But,, therefore, also slow than 162 ones of outlet rollers representing that with dot-and-dash line the double dot dash line of part band ratio of elongation represents that part is big.The image of reality is formed (toner picture of all kinds superimposed) influential part is and photoconductor drum 101M of all kinds, 101C, 101Y, the part that 101K is relative, the i.e. zone of representing with dot-and-dash line, therefore, even rotating outlet roller 162 detects tape speeds and implements FEEDBACK CONTROL being subjected to that some effects are represented in double dot dash line, the feedback quantity deficiency, this target velocity of tape speed is slow.Shown in Figure 18 C, transfer printing moving belt 150 revolution beginning during back 40 seconds variable quantity big, slower than target velocity.
On the other hand, real image is formed influential part is and photoconductor drum 101M of all kinds, 101C, 101Y, the part that 101K is relative, the i.e. zone of representing with dot-and-dash line, bottom right roller 166 is subjected to this dot-and-dash line to represent that regional effect turns round, at these bottom right roller 166 position probing tape speeds, according to detected tape speed, carry out FEEDBACK CONTROL, make the tape speed of 166 ones on bottom right roller become target velocity, real image is formed influential part also become target velocity, shown in Figure 18 A, revolution beginning back variable quantity is little, can prevent color shift.
In the laser printer of present embodiment, the ratio that is provided with as the distance (following brief note is " photoconductor drum spacing ") of 111 of each photoconductor drums of the girth of the bottom right roller 166 of the scrambler 120 of tape speed detection means and image-forming assembly of all kinds is set at roughly ratio of integers.It is the reasons are as follows: use the rotary encoder occasion as the tape speed detection means, the slit plate of one of its constituent part (in the present embodiment for dish 121, with reference to Figure 17) is installed to an axle 166a who is the bottom right roller 166 in the present embodiment, and upward precision prescribed is very high.But the setting-up eccentricity that will accomplish slit plate is zero also to be unpractical, therefore, need consider the error that this off-centre causes in advance.
That is, the eccentric caused error of slit plate changes detected as tape speed, and the inversion of this testing result is fed control mutually, drives transfer printing moving belt 150.Therefore, the mutually caused tape speed of this inversion taking place change occasion, also needs to make it that color shift does not take place.Same reason, the eccentric precision of speed measuring roll itself also can cause color shift.So, as mentioned above, the ratio of the girth of bottom right roller 166 and photoconductor drum spacing is set at roughly ratio of integers, in the present embodiment, the girth of bottom right roller 166 is made as 1/2nd of photoconductor drum spacing, if axle two weeks of revolution of scrambler are installed, just in time become the position of toner transfer printing at next photoreceptor.Therefore, in each photoreceptor position, the position in the velocity variations cycle of the caused band of dish setting-up eccentricity is consistent, and the position offset of each color image becomes with amount, and color shift does not take place the result.Certainly, the roller girth was not limited to 1: 2 with the ratio of photoconductor drum spacing, so long as ratio of integers is just no problem.
About the eccentric precision of speed measuring roll itself, have only its precision of raising, can be from technology, material constitutes aspects such as (wall thickness) and addresses.Specifically, stainless steel or aluminium occasion with the iron phase ratio, can be saved surface treatment procedure, and high precision is easy to get.In addition, structurally, thick-walled structure prevents to add man-hour distortion than thin-wall construction is easy.But,, will cause that moment of inertia increases, and reduces the FEEDBACK CONTROL performance if increase wall thickness excessively.
In the explanation, relating to " roller girth " in the above, says closely, should be to add 1/2nd tape thickness at roller on directly, and on duty with circular constant with gained obtains above-mentioned " roller girth ".Above-mentioned " roughly integer this " is made as the allowable error degree when making, this degree error, and people's visually imperceptible color shift, no problem.
At this, the relation of band elongation and color shift amount is described,, suppose that whole elongations of band become color shift here, and be that example describes to the side-play amount of black with magenta.
Magenta is made as 294mm with photoconductor drum 111M and black with the distance between the photoconductor drum 111K, and roller footpath (2r) is made as 31.2mm, and tape thickness t is made as the 0.2mm occasion, is calculated as follows:
(2r+t/2)·π＝(31.2+0.1)·3.14＝98.28mm
Add directly that with the roller that does not have the elongation occasion 1/2nd tape thickness obtains 31.3mm during datum velocity, datum velocity is 125.3117mm/sec, and the write time difference of M and K is 2.346149641sec.At this moment, the driven roller winding number is 76.4625rpm.
Since the influence of heat, the band elongation, thickness becomes 0.158mm, and 1/2nd tape thickness becomes 0.079mm, and roller adds that directly 1/2nd tape thickness becomes 31.279mm.At this moment tape speed is 125.2264539mm/sec, and relative datum speed reduces by 0.068%.This speed is low, and then being with the elongation ratio also is 0.068% if all be presented as color shift, and 0.068% of the distance between M-K equals 0.19992mm, promptly produces the color shift of 200 μ m.
Transfer belt velocity variations when the following describes the variation of speed measuring roll external diameter.
If speed measuring roll external diameter increases by 0.068%, promptly Φ 15.5 → Φ 15.51054, and then transfer belt speed increases by 0.068% too, and 0.068% of the distance between M-K equals 0.19992mm, promptly produces the color shift of 200 μ m.
But, the color shift of the about 200 μ m the when color shift of the about 200 μ m when above-mentioned band extends and measuring roll expand, the color shift direction of relative datum look opposite.
As mentioned above, if since the influence of heat, the band local elongation, then tape speed reduces, if the speed measuring roll expands, then tape speed increases, and color shift can take place.But, according to the present invention, detect tape speed, carry out FEEDBACK CONTROL, can prevent effectively that color shift from taking place.In addition, as mentioned above, make the ratio of roller girth and photoconductor drum spacing roughly become ratio of integers,, also can prevent the color shift that causes because of its feedback even the error occasion takes place because the eccentric error of scrambler dish makes tape speed detect.
In the present embodiment, use the speed detection means of rotary encoder as transfer printing moving belt 150.Rotary encoder can cover or the inscape of airtight scrambler with simple structure, is easy to prevent dirty dirty influences such as toner or dust.And can adjust sensor part, keep high precision easily, that is, can realize high durable and high precision simply as the rotary encoder of speed detection means.
But, be not limited to rotary encoder as the speed detection means of transfer printing moving belt 150, also can use other structures.For example, on transfer printing moving belt 150, be provided with fixed reference mark, read this mark by laser etc., also can detect tape speed, thereby carry out FEEDBACK CONTROL, prevent color shift.
In the present embodiment, select bottom right roller 166, be provided as the rotary encoder 120 of speed detection means, but the roller that is used to be provided with rotary encoder is not limited to bottom right roller 166 as the place that the band temperature variation takes place hardly.For example, also can mend the place as the marquis that scrambler is set with leaving photographic fixing assembly inlet roller 161 far away.Certainly, the present embodiment occasion, inlet roller 161 is removable, is difficult to be provided with the speed detection means.Among the roller of fixed configurations,, on the roller of farthest such as optical writing device scrambler is set leaving for example fixing device of thermal source.
In the present embodiment, between bottom right roller 166 that scrambler 120 is set and driven roller 163, be provided with jockey pulley 165, band is invested tension force.At this moment, along the moving direction of band, the position of each roller 163,165,166 relation is made as in the downstream of driven roller 163 roller 165 is set, and in the downstream of roller 165 roller 166 is set.In the relation of this position, be provided with between the bottom right roller 166 of scrambler 120 and the driven roller 163 jockey pulley 165 is set, prevent from the band slippage to take place on 166 ones on bottom right roller, can more correctly detect tape speed.
Below, the FEEDBACK CONTROL of intermediate transfer belt is described, as third embodiment of the invention.
Figure 20 is the summary pie graph of tandem type color laser printer of the intermediate transfer mode of third embodiment of the invention,
Dispose the color printer of four picture mounting body tandem moor side by side in the top of intermediate transfer belt 130.Intermediate transfer belt 130 is erected at driven voller 131, driven roller 132, and subtend roller 133 is pressed on 134 4 rollers of roller.Below this intermediate transfer belt 130, the transfer belt 135 of joining at 133 configurations of subtend roller and intermediate transfer belt 130.Photographic fixing assembly 107 is configured to and this transfer belt 135 adjacency.Other and Fig. 9 device same section are marked with same-sign, and omission is described.
In the color printer of the intermediate transfer mode of present embodiment, on the photoconductor drum of each image-forming assembly, form each color image, the image congruencing transfer printing of all kinds on this photoconductor drum on intermediate transfer belt 130, is formed coloured image on intermediate transfer belt 130.Supply with transfer paper from paper feeding cassette 103, send into the transfer position of above-mentioned subtend roller 133 and transfer belt 135 subtends, the coloured image on the above-mentioned intermediate transfer belt 130 is transferred on the transfer paper in above-mentioned transfer position, then, is sent to 107 photographic fixing of photographic fixing assembly.Transfer paper after the photographic fixing can be discharged on row's paper platform 108 above the device, or on row's paper disc of device side.
In the present embodiment,, carry out FEEDBACK CONTROL, make intermediate transfer belt 130 speed become target velocity by the speed of speed detection means (not having diagram) detection intermediate transfer belt 130.Speed detection means as intermediate transfer belt 130 is not particularly limited.At this, rotary encoder is arranged on the driven voller 131.The formation of rotary encoder and action are identical with Fig. 9 embodiment occasion.
In the present embodiment, among the roller of supporting intermediate transfer belt 130, the driven voller 131 that is provided with rotary encoder leaves in image processing system as the photographic fixing assembly 107 of largest heat source farthest, is positioned at the place that the occurrence temperature hardly of band changes.
If driven roller 132 or be pressed into roller 134 the axle on the scrambler occasion is set, because driven roller 132 or be pressed into roller 134 to leave photographic fixing assembly 107 near, if detect the speed of intermediate transfer belt 130 there, carry out FEEDBACK CONTROL, then identical in the speed occasion that outlet roller 162 detects transfer printing moving belt 150 with second embodiment shown in Figure 9, can not carry out the good FEEDBACK CONTROL of precision.In addition, speed measuring roll thermal expansion occasion also with top second embodiment in illustrated identical.
But, in the present embodiment, take following scheme:
(1) in the place that the influence of thermal source fixing device does not almost have, i.e. the place of the occurrence temperature hardly of band variation is provided with the speed detection means of intermediate transfer belt, carries out FEEDBACK CONTROL.
(2) even the accumulation of heat gradually of speed measuring roll, but owing to adopt the material-structure (wall thickness) that is not subject to its influence, can improve the FEEDBACK CONTROL precision, can prevent color shift effectively, that is, can prevent effectively that the tandem type coloured image of intermediate transfer mode from forming the color shift of device.
As the speed detection means of intermediate transfer belt, except adopting rotary encoder, can also adopt reference mark for example is set on intermediate transfer belt, carry out modes such as optically read, this is identical with above-mentioned second embodiment.
As the speed detection means of intermediate transfer belt, adopt the rotary encoder occasion, make the ratio of girth and photoconductor drum spacing of driven voller 131 that scrambler is housed be roughly ratio of integers, can prevent color shift effectively, this is also identical with above-mentioned second embodiment.
FEEDBACK CONTROL to belting of the present invention can be applicable to that also the monochrome image of intermediate transfer mode forms device, and is still, as mentioned above, especially effective to preventing color shift in the tandem coloured image formation device of intermediate transfer mode.
Below, the FEEDBACK CONTROL of photoreceptor belt is described, as fourth embodiment of the invention.
Figure 21 is the major part summary pie graph that the coloured image that is provided with banded photoreceptor of fourth embodiment of the invention forms device.
As shown in the figure, the top of the photoreceptor belt that sets up 140 triangular in shape is four developing apparatus 144M of configuration side by side, 144C, 144Y, 144K.Photoreceptor belt 140 is erected at driven voller 141, and outlet roller 142 is on 143 3 rollers of driven roller.
At the left of this photoreceptor belt 140, configuration intermediate transfer drum 145.At the left of this intermediate transfer drum 145, configuration transfer belt 146.Configuration photographic fixing assembly 107 above transfer belt 146.Other and Fig. 9 device same section are marked with same-sign, and omission is described.
The coloured image that is provided with banded photoreceptor at present embodiment forms in the device, forms the electrostatic latent image corresponding with image information of all kinds on photoreceptor belt 140, from developing apparatus 144M of all kinds, 144C, 144Y, 144K invests toner to above-mentioned electrostatic latent image, but makes it become video.The superimposed transfer printing of above-mentioned toner picture order on intermediate transfer drum 145, is formed coloured image on intermediate transfer drum 145.Supply with transfer paper from paper feeding cassette 103, send into the transfer position of above-mentioned intermediate transfer drum 145 and transfer belt 146 subtends, the coloured image on the above-mentioned intermediate transfer drum 145 is transferred on the transfer paper in above-mentioned transfer position, then, is sent to 107 photographic fixing of photographic fixing assembly.Transfer paper after the photographic fixing is discharged on row's paper platform 108 above the device.
In the present embodiment,, carry out FEEDBACK CONTROL, make photoreceptor belt 140 speed become target velocity by the speed of speed detection means (not having diagram) detection photoreceptor belt 140.Speed detection means as photoreceptor belt 140 is not particularly limited.At this, rotary encoder is arranged on the driven voller 141.The formation of rotary encoder and action are identical with Fig. 9 embodiment occasion.
In the present embodiment, among the roller of supporting photoreceptor belt 140, the driven voller 141 that is provided with rotary encoder leaves in image processing system as the photographic fixing assembly 107 of largest heat source farthest, is positioned at the place that the occurrence temperature hardly of band changes.
If on the axle of outlet roller 142, the scrambler occasion is set, because it is near that outlet roller 142 leaves photographic fixing assembly 107, if detect the speed of photoreceptor belt 140 there, carry out FEEDBACK CONTROL, then identical in the speed occasion that outlet roller 162 detects transfer printing moving belt 150 with second embodiment shown in Figure 9, can not carry out the good FEEDBACK CONTROL of precision.In addition, speed measuring roll thermal expansion occasion also with top second embodiment in illustrated identical.
But, in the present embodiment, take following scheme:
(1) in the place that the influence of thermal source fixing device does not almost have, i.e. the place of the occurrence temperature hardly of band variation is provided with the speed detection means of photoreceptor belt, carries out FEEDBACK CONTROL.
(2) even the accumulation of heat gradually of speed measuring roll but owing to adopt the material-structure (wall thickness) be not subject to its influence, can improve the FEEDBACK CONTROL precision, can prevent color shift effectively, that is, the coloured image that can prevent to be provided with photoreceptor belt effectively forms the color shift of device.
The present embodiment occasion is provided with intermediate transfer drum 145 between driven roller 143 and the photographic fixing assembly 107, therefore, also scrambler can be arranged on the driven roller 143, this occasion is left the distance of optical writing device 102, is not vulnerable to the heat affecting of optical writing device 102.
As the speed detection means of photoreceptor belt, except adopting rotary encoder, can also adopt reference mark for example is set on photoreceptor belt, carry out modes such as optically read, this is identical with above-mentioned second embodiment.
Above with reference to description of drawings embodiments of the invention, but the present invention is not limited to the foregoing description.Can do all changes in the technology of the present invention thought range, they all belong to protection scope of the present invention.
For example, in the above among the embodiment, exemplified rotary encoder as the means of the velocity variations that detects belting and be illustrated, but the present invention is not limited thereto, also can adopt other to be used for the detection speed changeable device.
Have again, from picture mounting body directly with second embodiment of each color image transfer printing on recording chart, having enumerated the transfer printing moving belt is movable body, at least Dai a part can a part of relatively photoconductor drum connect from, but the present invention is not limited thereto, also can adopt the transfer printing moving belt of fixed configurations, often contact with picture mounting body.
Have again, among the embodiment, enumerated four consecutives row or four look tandems as tandem moor, but the present invention is not limited thereto, and chromatic number is not limited, and also can be two looks, three looks, the five colors etc. in the above.
Have again, among the embodiment, described optical writing device in the above, developing apparatus, each several part structures such as fixing device, but the present invention is not limited thereto, also can adopt other structures.
Have, among the embodiment, enumerated printer as image processing system and be illustrated, but the present invention is not limited thereto in the above, to other image processing systems duplicating machine for example, facsimile recorder, compounding machine etc. also can be suitable for.

Claims (29)

1. image processing system is provided with:
At least one is as the mounting body, forms the toner picture at this on as the mounting body;
The ring-type transfer belt is erected on some backing rolls, is configured to and above-mentioned picture mounting body subtend;
CD-ROM drive motor, at least one backing roll constitutes driven roller among above-mentioned some backing rolls, and the above-mentioned driven roller revolution of above-mentioned drive motor is moved to drive above-mentioned transfer belt;
Detected body, at least one backing roll constitutes measuring roll among above-mentioned some backing rolls, and above-mentioned detected body turns round with above-mentioned measuring roll;
Pick-up unit detects the angular velocity of above-mentioned detected body;
Control device according to the testing result of above-mentioned detection device, is controlled above-mentioned CD-ROM drive motor, makes the speed of above-mentioned transfer belt become target velocity;
Be formed on above-mentioned as the toner on the mounting body as transfer printing in mounting in transporting on the above-mentioned transfer belt on the recording medium of coming, perhaps will be formed on toner on the above-mentioned picture mounting body as transfer printing on above-mentioned transfer belt, again with the toner on the transfer belt as transfer printing on recording medium, obtain document image;
Above-mentioned detected body directly is fixed on the roll shaft that is used to support above-mentioned measuring roll.
2. according to the image processing system described in the claim 1, it is characterized in that, make that the circumferential position of circumferential position and the least radius portion of the central axis of the relative above-mentioned roll shaft of above-mentioned detected body of maximum radius portion of central axis of the above-mentioned relatively roll shaft of above-mentioned measuring roll is roughly consistent, above-mentioned detected body is fixed on the above-mentioned roll shaft with this state.
3. according to the image processing system described in the claim 2, it is characterized in that, in the least radius standard laid down by the ministries or commissions of the Central Government of the central axis of the above-mentioned relatively roll shaft of above-mentioned detected body with mark.
4. according to the image processing system described in the claim 1, it is characterized in that, make that the circumferential position of circumferential position and the maximum radius portion of the central axis of the relative above-mentioned roll shaft of above-mentioned detected body of least radius portion of central axis of the above-mentioned relatively roll shaft of above-mentioned measuring roll is roughly consistent, above-mentioned detected body is fixed on the above-mentioned roll shaft with this state.
5. according to the image processing system described in the claim 4, it is characterized in that, in the maximum radius standard laid down by the ministries or commissions of the Central Government of the central axis of the above-mentioned relatively roll shaft of above-mentioned detected body with mark.
6. image processing system is provided with:
At least one is as the mounting body, forms the toner picture at this on as the mounting body;
The band conveyer, mounting recording medium, be formed on toner on the picture mounting body as transfer printing on recording medium;
Fixing device carries out photographic fixing to the uncertain image of transfer printing on recording medium; It is characterized in that:
Be provided with speed detector, detect the speed of band conveyer,, carry out FEEDBACK CONTROL, make the speed of above-mentioned band conveyer become target velocity according to the detected value of above-mentioned speed detector;
Above-mentioned speed detector is configured in the place that the band temperature changes hardly.
7. image processing system is provided with:
At least one is as the mounting body, forms the toner picture at this on as the mounting body;
Intermediate transfer belt, with above-mentioned be formed on toner picture on the picture mounting body by above-mentioned intermediate transfer belt transfer printing on recording medium;
Fixing device carries out photographic fixing to the uncertain image of transfer printing on recording medium; It is characterized in that:
Be provided with speed detector, detect the speed of above-mentioned intermediate transfer belt,, carry out FEEDBACK CONTROL, make the speed of above-mentioned intermediate transfer belt become target velocity according to the detected value of above-mentioned speed detector;
Above-mentioned speed detector is configured in the place that the band temperature changes hardly.
8. image processing system is provided with:
Banded as the mounting body, this as the mounting body on order form electrostatic latent image;
Some developing apparatuss, be configured in above-mentioned band shape as the relative position of mounting body, make the above-mentioned latent electrostatic image developing that is formed on the picture mounting body;
The intermediate transfer body, but the video order stack of all kinds of above-mentioned gained is closed transfer printing on this intermediate transfer body, again with toner on the intermediate transfer body as transfer printing on recording medium;
Fixing device carries out photographic fixing to the uncertain image of transfer printing on recording medium, obtains coloured image; It is characterized in that:
Be provided with speed detector, detect the speed of above-mentioned band shape,, carry out FEEDBACK CONTROL, make above-mentioned band shape become target velocity as the speed of mounting body according to the detected value of above-mentioned speed detector as the mounting body;
Above-mentioned speed detector is configured in the place that the band temperature changes hardly.
9. according to any described image processing system among the claim 6-8, it is characterized in that the place that the band temperature of above-mentioned configuration speed pick-up unit changes hardly is the position away from the image processing system endogenous pyrogen.
10. according to the image processing system described in the claim 9, it is characterized in that above-mentioned thermal source is a fixing device.
11. the image processing system according to described in the claim 9 is characterized in that, above-mentioned thermal source is an optical writing device.
12. the image processing system according to described in the claim 9 is characterized in that, above-mentioned thermal source is fixing device and optical writing device.
13., it is characterized in that above-mentioned speed detector is a roller speed of gyration pick-up unit according to any described image processing system among the claim 6-8, detect and set up above-mentioned band conveyer or intermediate transfer belt or band shape speed of gyration as the roller of mounting body.
14. the image processing system according to described in the claim 13 is characterized in that, above-mentioned roller speed of gyration pick-up unit is a rotary encoder.
15. according to the image processing system described in the claim 13, it is characterized in that the roller of above-mentioned roller speed of gyration pick-up unit detection speed is to leave above-mentioned fixing device roller farthest among setting up above-mentioned band conveyer or intermediate transfer belt or banded roller as the mounting body.
16. according to the image processing system described in the claim 13, it is characterized in that, above-mentionedly comprise removable roller occasion among setting up above-mentioned band conveyer or intermediate transfer belt or banded roller as the mounting body, the roller of above-mentioned roller speed of gyration pick-up unit detection speed is to leave above-mentioned fixing device roller farthest among setting up the roller of above-mentioned band conveyer or intermediate transfer belt or the banded configuration that is fixed as the mounting body.
17. according to the image processing system described in the claim 13, it is characterized in that, between the roller and above-mentioned band conveyer or intermediate transfer belt or banded driven roller as the mounting body of above-mentioned roller speed of gyration pick-up unit detection speed, the configuration jockey pulley invests above-mentioned band with tension force.
18. the image processing system according to described in the claim 14 is characterized in that, above-mentioned rotary encoder is configured in the container with air-tight state roughly.
19. according to the image processing system described in claim 6 or 7, it is characterized in that, be provided with some picture mounting bodies, be configured in and above-mentioned band conveyer or the relative position of intermediate transfer belt, with being formed on as the toner on the mounting body as superimposed transfer printing, can form coloured image transporting by above-mentioned band conveyer on the recording medium of coming or on the intermediate transfer belt.
20. according to the image processing system described in the claim 19, it is characterized in that, be provided with roller speed of gyration pick-up unit, as speed detector, the speed of gyration of the roller of above-mentioned band conveyer or intermediate transfer belt is set up in detection, and the girth of the roller of this roller speed of gyration pick-up unit detection speed and above-mentioned some each ratios as the distance between the mounting body as the mounting body are roughly ratio of integers.
21. the image processing system according to described in the claim 13 is characterized in that, the employed material of roller that roller speed of gyration pick-up unit is installed has following characteristic: the external diameter expansivity to temperature is below 0.05%.
22. the image processing system according to described in the claim 13 is characterized in that, tries to achieve " for the 1 degree necessary merit of temperature (J) that rises " according to employed material of roller and quality thereof that roller speed of gyration pick-up unit is installed and is roughly more than 30 (J).
23. the image processing system according to described in the claim 13 is characterized in that, the linear expansion coefficient (1/ ℃) of the material of the roller of installation roller speed of gyration pick-up unit is roughly 25 * 10 -6Below.
24. the image processing system according to described in the claim 13 is characterized in that, the moment of inertia (kgfcm of the roller of roller speed of gyration pick-up unit is installed 2) be roughly below 35.
25. the image processing system according to described in the claim 13 is characterized in that, the material that the roller of roller speed of gyration pick-up unit is installed is an aluminium.
26. the image processing system according to described in the claim 13 is characterized in that, the material that the roller of roller speed of gyration pick-up unit is installed is an iron.
27. the image processing system according to described in the claim 13 is characterized in that, the material that the roller of roller speed of gyration pick-up unit is installed is a stainless steel.
28. the image processing system according to described in the claim 13 is characterized in that, the material that the roller of roller speed of gyration pick-up unit is installed is Rhometal (Fe-Ni36%).
29. the image processing system according to described in the claim 13 is characterized in that, the material that the roller of roller speed of gyration pick-up unit is installed is the material that is made of carbon fiber.
CNB2004100713096A 2003-07-18 2004-07-19 Apparatus for image forming Expired - Fee Related CN100489689C (en)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
JP2003199451A JP2005037620A (en) 2003-07-18 2003-07-18 Image forming apparatus
JP199451/03 2003-07-18
JP199451/2003 2003-07-18
JP290282/2003 2003-08-08
JP290282/03 2003-08-08
JP2003290282 2003-08-08
JP2004136026A JP4359533B2 (en) 2003-08-08 2004-04-30 Image forming apparatus
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CN100489689C (en) 2009-05-20
EP1498785B1 (en) 2015-12-09
EP1498785A8 (en) 2005-06-01
EP1498785A1 (en) 2005-01-19
US20070231022A1 (en) 2007-10-04
US7257339B2 (en) 2007-08-14
US7509074B2 (en) 2009-03-24

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